Multi-Cyano N-Heterocyclic Electrolyte Additive for High-Voltage Battery Stability
Solution Overview
Problem
Current lithium-ion battery electrolyte systems face deficiencies in cycle performance and storage performance at high voltage and high temperature, leading to reduced battery efficiency and safety.
Innovation Solution
Incorporating a multi-cyano six-membered N-heterocyclic compound as an additive in the electrolyte, which forms a protective film on the positive electrode material, reducing surface activity and inhibiting oxidation reactions, thereby enhancing cycle and storage performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional electrolyte system with lithium hexafluorophosphate and cyclic/chain carbonates is used, then the battery can operate with basic performance, but the cycle performance and storage performance deteriorate under high voltage and high temperature conditions
Solution Approach 1:
The patent applies preliminary action by introducing the multi-cyano six-membered N-heterocyclic compound additive that proactively forms a protective film on the positive electrode surface before oxidation can occur. This pre-formed protective layer prevents subsequent degradation reactions, thereby improving cycle performance and storage stability under high temperature conditions without sacrificing basic electrolyte functionality.
2Productivity
If the positive electrode material surface is highly active, then electrochemical reactions can proceed efficiently, but the electrolyte oxidizes more readily leading to poor cycle life
Solution Approach 1:
The patent employs the multi-cyano six-membered N-heterocyclic compound as an intermediary substance that mediates between the positive electrode material and the electrolyte. This additive forms an intermediate protective film that allows beneficial electrochemical reactions to proceed while blocking harmful oxidation reactions, thus maintaining productivity while improving cycle life.
3Use of energy by moving object
If high voltage is applied to achieve high energy density, then battery capacity increases, but electrolyte decomposition and gas production increase
Solution Approach 1:
The patent converts the potentially harmful high-voltage-induced electrolyte decomposition into a beneficial outcome by using the multi-cyano six-membered N-heterocyclic compound to form a stable protective film. This film transforms the high-voltage stress that would normally cause gas production into a controlled process that enhances energy density while suppressing harmful decomposition reactions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The use of multi-cyano six-membered N-heterocyclic compounds in the electrolyte significantly improves cycle performance at high temperature and high voltage, reduces gas production, and enhances storage performance by passivating the positive electrode surface, leading to improved battery efficiency and longevity.
Implementation Method 1
using a multi-cyano six-membered N-heterocyclic compound as an additive of the electrolyte can effectively inactivate the surface of a positive electrode material
Implementation Method 2
effectively passivate surface activity of the positive electrode material and inhibit oxidation of the electrolyte
Data Source
Figure 1~2
Figure 3
AI summary
The present disclosure relates to the field of energy storage materials, and particularly, to an electrolyte and a battery using the electrolyte. The electrolyte contains an additive selected from a group consisting of multi-cyano six-membered N-heterocyclic compounds represented by Formula 1-1, Formula 1-2 and Formula 1-3, and combinations thereof. The addition of the multi-cyano six-membered N-heterocyclic compound as an additive in the electrolyte of the present disclosure can effectively passivate surface activity of the positive electrode material and inhibit oxidation of the electrolyte. The battery using the electrolyte according the present disclosure has good cycle performance at high temperature and high voltage and good storage performance, while gas production of the battery is reduced.